Alert archive / Oregon / Freeze Warnings in 2011

Freeze Warning 4, NWS Pendleton, OR

April 21, 20115 counties in Oregon; 5 counties in Washington

NWS Pendleton, OR issued this freeze warning at Apr 21, 2011, 2:51 PM PDT for 5 counties in Oregon; 5 counties in Washington. It took effect at Apr 22, 2011, 12:00 AM PDT. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 21, 2011, 2:51 PM PDT (21:51 UTC)
In effect from: Apr 22, 2011, 12:00 AM PDT
Expired: Apr 22, 2011, 10:00 AM PDT
In force: 10 hr
Issued by: NWS Pendleton, OR

Counties Gilliam County, OR, Morrow County, OR, Sherman County, OR, Umatilla County, OR, Wasco County, OR, Benton County, WA, Columbia County, WA, Franklin County, WA, Klickitat County, WA, Walla Walla County, WA

The radar

The Pendleton radar (KPDT), 59 km from the middle of the area, began a volume at 21:54 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 9.9 hours before the alert went out and 321 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1489 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 39 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pendleton, OR wrote its last area forecast discussion before this freeze warning went out at Apr 21, 2:30 PM PDT, 21 minutes earlier.

Area forecast discussion, Apr 21, 2:30 PM PDT, 21 minutes before

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Hazardous weather outlook, Apr 21, 6:07 AM PDT, 8 hours 44 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
607 AM PDT THU APR 21 2011

ORZ041-042-044-049-050-502-503-505>509-WAZ024-026>030-520-521-
221300-
EASTERN COLUMBIA RIVER GORGE OF OREGON-NORTH CENTRAL OREGON-
LOWER COLUMBIA BASIN OF OREGON-GRANDE RONDE VALLEY-WALLOWA COUNTY-
NORTHERN BLUE MOUNTAINS OF OREGON-
SOUTHERN BLUE MOUNTAINS OF OREGON-JOHN DAY BASIN-OCHOCO-
JOHN DAY HIGHLANDS-
FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON-
FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON-
EAST SLOPES OF THE OREGON CASCADES-
EASTERN COLUMBIA RIVER GORGE OF WASHINGTON-KITTITAS VALLEY-
YAKIMA VALLEY-LOWER COLUMBIA BASIN OF WASHINGTON-
FOOTHILLS OF THE BLUE MOUNTAINS OF WASHINGTON-
NORTHWEST BLUE MOUNTAINS OF WASHINGTON-
EAST SLOPES OF THE WASHINGTON CASCADES-SIMCOE HIGHLANDS-
607 AM PDT THU APR 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...TODAY AND TONIGHT

SNOW
     NORTHWEST BLUE MOUNTAINS OF WASHINGTON, WALLOWA COUNTY,
     NORTHERN BLUE MOUNTAINS OF OREGON

STRONG WIND
     KITTITAS VALLEY

A COLD FRONT MOVING THROUGH THE REGION WILL CAUSE RAIN AND SNOW
SHOWERS. NEW SNOW ACCUMULATIONS OF AROUND 2 TO 3 INCHES ARE EXPECTED
ACROSS WALLOWA COUNTY WITH 3 TO 5 INCHES IN THE NORTHERN BLUE
MOUNTAINS. WINTER WEATHER ADVISORIES ARE IN EFFECT FOR THESE AREAS.
PLEASE REFER TO PRODUCT PDXWSWPDT FOR FURTHER DETAILS.

BREEZY TO WINDY CONDITIONS CAN ALSO BE EXPECTED WITH VERY WINDY
CONDITIONS IN THE KITTITAS VALLEY. A WIND ADVISORY HAS THEREFORE
BEEN ISSUED FOR THE KITTITAS VALLEY. PLEASE REFER TO PRODUCT
PDCNPWPDT FOR DETAILS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

DRIER AND WARMER WEATHER IS EXPECTED ON FRIDAY AND SATURDAY. ANOTHER
STORM SYSTEM WILL MOVE INTO THE AREA ON SUNDAY. PERIODIC UNSETTLED
WEATHER WILL THEN CONTINUE THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

GRAPHICAL FORECASTS OF WEATHER HAZARDS OUT TO SEVEN DAYS
ARE DISPLAYED ON THE WORLD WIDE WEB AT:

WWW.WRH.NOAA.GOV/PDT/CURRENTHAZARDS/HWO.HTML

ALL LETTERS IN THE ABOVE URL ARE LOWER CASE.

In the hours before

Local storm report, Apr 21, 10:39 AM PDT, 4 hours 12 minutes before

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Local storm report, Apr 21, 11:04 AM PDT, 3 hours 47 minutes before

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The office that day

Everything else NWS Pendleton, OR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 3:23 AM PDT	Wind Advisory	PDT	Kittitas, Yakima	20 hr

Nearby

Freeze Warnings in Oregon, 2011 Freeze Warnings in Washington, 2011 Every freeze warning in 2011

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.